06-11-2009 11:03 PM - edited 03-01-2019 02:12 PM
Hello!
I have a pure dense mode network without any active senders/receivers.
Despite
this I have the following in the mroute table (on all routers).
(*, 224.0.1.40), 01:55:45/00:02:27, RP 0.0.0.0, flags: DCL
B Incoming interface: Null, RPF nbr 0.0.0.0
B Outgoing interface list:
B B B Ethernet0/0, Forward/Dense, 01:55:15/00:00:00
B B B Ethernet0/1, Forward/Dense, 01:55:40/00:00:00
B B B Serial0/0.1, Forward/Dense, 01:55:45/00:00:00
Is this normal?
Thank you!
Regards,
V.Vasilev
06-12-2009 03:32 AM
Hi Vladislav,
This is indeed normal behavior. All cisco routers subscribe to the multicast group address 224.0.1.40 automatically when configured for multicast. This group address is used to get RP information from the mapping agent(s).
Regards
06-15-2009 05:42 AM
Hi Vasilev
224.0.1.40 and 39 is being used by auto-rp. This only comes when you configure ip pim sparse-dense mode.
regards
shivlu jain
06-15-2009 05:57 AM
Shivlu,
In fact, you will have the 224.0.1.40 entry in the multicast routing table regardless whether sparse-mode, dense-mode or sparse-dense-mode is configured.
Regards
12-24-2012 10:49 AM
Yes..This is a normal behaviour.This is because of autoRP which is on by default
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